I’d suggest using the search function. It’s when a user is either not a member of the forum, or was a member but got their status somehow taken away. They have a trust level of 0, meaning they’re a visitor, and cannot post on the forums. If you want to know more about the different ranks and what they mean on the forum, check out this pinned article that will tell you all you need to know.
Bumping posts is okay as long as you have more information to provide. Try adding more information to a post, to get it noticed. It could be anything from an update, to screenshots, to videos.